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(No Model.) E. M. 2Sheets-Sheet l.

FURNACE GfRATE.

Patented De. 22, 1891.

No.V 465,527.

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(No Mdel.) E' Ml BID-.GENTOBLIER 2 Sheets-Sheet 2.

PURNAGB GRATB. No. 465,527. Patented Dec. 22, 1891;

rVNTTED STATES PATENT OFFICE.

EMIL M. IIUGENTOBLER, OF NEWv YORK, N. Y., ASSIGNOR TO THE ABENDROTH di ROOT MANUFACTURING COMPANY, OF SAME PLACE.

FU RNACEeGRATE.

SPECIFICATION forming part of Letters Patent No. 465,527, dated December 22, 1891.

Application filed August l, 1890. Serial No. 360.693- (No model.)

To all whom it may concern:

Be it known that I, EMIL M.I1IUGENTQBLER, of New Yorlnin the county and State of New York, have invented a certain new and useful 5 Improvementin Furnace-Grates, of which the following is a specification.

The object of myimprovem'ent is to provide a f urnace and grate for a steam-boiler capable of burning bagasse*or, in other words, the

1o refuse of sugar-cane-while in a green state,

without previous drying.

I will describe a furnace and its appurtenances embodying 1n yim provement, and then point out in the novel features in the claims.

In the accompanying drawings, Figure l is a verticalsection taken parallel with the front of a boiler and illustrating the lower part of the furnace. Fig. 2 is a vertical section taken in a plane at right angles to Fig. l, and also 2o illustrating the lower part of the furnace. Fig. 3 is a horizontal section taken above the plane of the grate.

Similar letters of reference designate corresponding` parts in all the figures.

2 5 B designates a furnace having a reverberatory arch (not shown) at its upper end sprung from the walls h. Its lower portion b is more contracted than the upper and has the grate O arranged within it. A short distance above the grate there is an upwardlyiarin g portion b2, which extends from the lower contracted portion Z1 to the upper portion of the chamber.

Conduits d', receiving air from any desired 3 5 source, are formed in the wall of the furnace,

and each conduit d communicates by a number of openings cl2 with the interior of the chamber of the furnace beneath the grate.

I will now explain the construction of the 4o grate. It is composed of a number of bars c c2, capable of swinging. The bars c will be connected in one series and the bars c2 will be connected in another series, and the two series will be made to rock independently and reversely. The end bars need not be connected with the others. All the bars are shown as supported upon plates l?, consisting of vertical portions and horizontal portions.. These plates are built into the masonry forming the 5o walls of the furnace-chamber. Above them the walls have notches formed in them of a size t-o receive the grate-bars. The upper edge of the vertically-extending portions of the plates P are notched to receive the end portions of the grate-bars. The bottoms of these 5 5 notches and the contiguous portions of those grate-bars which are to swing will preferably be rounded to facilitate the swinging. It will be seen that each one of the bars is longitudinally depressed from the ends to the middle. 6o Preferably they will be curved continuously throughout their length.

Several important advantages are obtained by the depression of the grate-bars. f The area of pen etration that the air-blast has, compared with the area of the bed of fuel measured in a horizontal line, is very much increased. Olinkers forming during combustion will while in a iiuid state pass down to the middle portion of the grate-bars, whence they can be 7o more easily removed. As the bars are capable of rocking, it is particularly desirable for the clinliers to descend to the depressed middle portionsof the bars,because as these portions are very considerably removed from the axes of oscillation they will4 have a much greater movement in rocking than the more elevated portions of the bars. Not only will this extra motion tend to disintegrate the clinkers,but it will also afford facility for the 8o lpassage of the clinkers between the bars. It

will be seen that these bars are provided atintervals with plate-like portions c. I deem it advantageous to arrange these at approximately right angles to the length of the bars. 8 5 lVhere the bars are curved, as in the present instance, they may be approximately in the position of radii of the curve. In the present instance the plate-like portions are of triangular form,one side of each being horizontal, 9o while its bar occupies a normal position and the other two sides converging downwardly. The plate-like portions of all the bars, excepting those of the end bars, project in the present example of the improvement nearly from o 5 opposite sides of the bar and the plates of one bar alternating with or passing between those of an. adjacent bar. Most of the plate-like portions of the end bars are shown as projecting only from the inner side, although some roo have a slight projection from the outer side. In the present example of my improvement the end bars do not have any rocking movement. c2 have downward projections c3, provided with longitudinal slots in their lower portions. The bottoms of the slots are preferably rounded. Rods c4 c5, having notches on their under sides, are passed through the slots of the projections c3, and by means of their notches engage with the bottoms of said slots. Obviously a longitudinal movement of these rods will effect a swinging of the grate-bars. The two rods c4 c5 are shown as arranged to lslide in guides cprovided' on the front ofthe steamboiler, and are engaged with a three-armed lever c7, which is fulcrumed by a pin cS to a bracketA e9, affixed to the front of the steam-boiler. Two of these arms of this lever are notched to receive projections, with which the ends of the rods-are provided. The third arm is provided with a socket in which a rod ci is inserted to form ahandle.

It will be seen that all of the bars cl XVhat I claim as my invention, and ,desire tofsecure by Letters Patent, is

l. The combination, in a furnace, of two sets of swinging grate-bars depressed longitudinally toward the middle, the bars of one set swinging in a reverse direction to those of the other, means for swinging the bars, and transversely-extending plate-like portions on each of the swinging bars, substantially as specied.

2. The combination, with a furnace, of swinging grate -bars 'depressed toward the middle, transversely-extending plate-like p0rtionsV on said bars,andv end'bars'stationary1 or unconnected tov the others, substantially as specified.

In testimony whereof I have, signed-z my name t0 this specification in the presence-of two l subscribing witnesses.

' EMIL M. HUGENTOBLER; Witnesses: I

S. O. EDMoNDs, THOMAS LITTLEJOHN. 

